<template>
  <div class="tab-bar-item" @click="itemClick">
    <div v-if="!isActive"><slot name="item-icon"></slot></div>
    <div v-else><slot name="item-icon-active"></slot></div>
    <div v-bind:style="activeStyle"><slot name="item-text"></slot></div>
  </div>
</template>

<script>
    export default {
      name: "TabBarItem",
      props:{
        path: String,
        activeColor:{
          type:String,
          default:'deeppink'
        }
      },
      data(){
          return{
            // isActive:false
          }
      },
      computed:{
        isActive(){
          // /home -> item1(/home) = true
          // /home -> item2(/category) = false
          // /home -> item3(/cart) = false
          // /home -> item4(/me) = false
          // indexOf() 方法可返回某个指定的字符串值在字符串中首次出现的位置。如果要检索的字符串值没有出现，则该方法返回 -1。
          return this.$route.path.indexOf(this.path) !== -1
        },
        activeStyle(){
          return this.isActive?{color: this.activeColor}:{}
        },
      },
      methods:{
        itemClick(){
          this.$router.replace(this.path)
        },
      }
    }
</script>

<style scoped>

  .tab-bar-item{
    flex: 1;
    text-align: center;
    height: 49px;
    font-size: 14px;
  }

  .tab-bar-item img{
    width: 24px;
    height: 24px;
    margin-top: 3px;
    vertical-align: middle;
    margin-bottom: 2px;
  }


</style>
